Power operated press



Aug. 23, 1955 H. D. CHALLEN POWER OPERATED PRESS 2 Sheets-Sheet 1 Filed July 14, 1952 INVENTOR HE /V/? Y /V/5 CHALLE/V Aug. 23, 1955 H. D. CHALLEN POWER OPERATED PRESS Filed July 14, 1952 2 Sheets-Sheet 2 INVENTUR HENRY DE/V/S CHALLE/V ATTORNEYS United States Patent POWER OPERATED PRESS Henry Denis Challen, Birmingham, England, assignor to Taylor & Challen Limited, Birmingham, England, a British company Application July 14, 1952, Serial No. 298,731

4 Claims. (Cl. 7836) This invention has reference to improvements relating to power operated presses of the kind wherein the dies of the press are in the form of a pair of co-operating vice faces such that when the vice is closed the equivalent of a split mould is formed into which a heated billet is placed and wherein recesses or bores are formed in the metal within the mould by the operation of the press by tools of which the main tool enters the metal in the main direction of flow of metal whilst a subsidiary tool or tools is or are caused to enter the metal in an opposite and/ or transverse direction relative to the main path of motion of the metal. For a clearer understanding of the kind of press to which the present invention relates reference may be made to the specifications of our earlier British Patents Nos. 367,137 and 480,160 which illustrate a press of this kind having four tools for forming four opposed cores or piercings in the work.

In such presses it has been found desirable that the subsidiary tools should enter the mould after the main tool and that they should move into the mould at a speed in excess of the speed of the main tool during the final portion of the inward stroke of the latter and the object of the present invention is to provide in a press of the aforesaid kind means for so timing and operating the subsidiary tools.

The invention consists of a power operated press of the kind referred to characterised by the interposition in the drive to the operating mechanism for the subsidiary tools of a clutch which is engaged automatically after a predetermined stroke of the main tool.

An embodiment of the invention will now be described by way of example as applied to a press of the kind disclosed in the complete specification of our earlier Letters Patent No. 480,160 and with reference to the accompanying drawings in which:

Fig. l is a part-sectional front elevation of suflicient of the press for an understanding of the present invention.

Fig. 2 is a fragmentary section on an enlarged scale taken along the line A-A of Fig. 1 looking in the direction of the arrows and Fig. 3 is a plan of the spring loaded thrust plate seen in Fig. 2.

The press follows known practice except that the main crankshaft which operates the main or upper vertically reciprocal tool is furnished with a toothed flywheel 4 which is in mesh with a pinion 5 forming part of the driving member of a known form of key clutch through which drive is transmitted to the subsidiary tools. The ratio of the gearing between the flywheel 4 and the pinion 5 is such that the speed of rotation of the driving member of the clutch is in excess of the speed of rotation of the main crankshaft of the press. The driven member 6 of the clutch forms part of or is connected to a crankshaft 7 through which the vertical reciprocal motion is imparted to the slides 8 by means of the connecting rod 9; one only of the slides 8 being shown in the drawings but there being one provided on either side of the press each connected, as is common practice, to impart motion to a horizontally reciprocal tool 10 and also at its lower end to a rockshaft 11 for imparting motion to the lower vertically reciprocal tool, The flywheel 4 is furnished with a face cam 12 which is adapted to co-operate with the roller 13 at the end of an arm 14 mounted on a rotatable spindle 15 in the upper portion of the press frame. This arm 14 and a shorter arm 14 on the spindle 15 are adapted to bear against an axially movable yoke 16, carrying the cam ring 17 whereby the key clutch is engaged or disengaged in known manner, the yoke being spring loaded in a clutch disengaging direction by means of springs 18.

In operation, during the final portion of the downward stroke of the main tool driven by the main crankshaft, for example, immediately prior to its final A" of motion in an inward direction; the cam strikes the roller 13 so as to rock the arms 14 and 14 about to traverse the thrust plate 16 carrying the cam ring 17 to the left as viewed in Fig. 1, thereby permitting the key clutch to engage in known manner so as to impart a drive to the subsidiary tools of the press. The key clutch maintains the driving engagement between the driving member 5 and the driven member 6 for one complete revolution of the driven member in the normal way and is then automatically disengaged by the springs 18. Due to the fact that the driving member 5 is rotated at a greater speed than the main crankshaft, during the last /4" of motion permitted to the main tool, the subsidiary tools enter the mould at a speed much in excess of the speed of the main tool and, for example, move inwardly 2" whilst the main tool is moving through A".

I claim:

1. In a power operated press having a rotating member for actuating a main tool, in combination, a gear wheel turned by such rotating member, a pinion meshing with said gear wheel and turning more revolutions per minute than said gear wheel, an auxiliary crank shaft for actuating an auxiliary tool, a clutch to connect said pinion to said auxiliary crank shaft, a rocking member for closing and opening said clutch, and a cam carried by said gear wheel in position to rock said rocking member for closing said clutch during a portion only of the rotation of said rotating member.

2. In a power operated press having rotating member for actuating a main tool, in combination, a gear wheel turned by such rotating member, a pinion meshing with said gear wheel and turning more revolutions per minute than said gear wheel, an auxiliary crank shaft for actuating an auxiliary tool, a clutch to connect said pinion to said auxiliary crank shaft, mechanism for closing and opening said clutch, and a cam carried by said gear wheel in position to actuate said mechanism for closing said clutch during a portion only of the rotation of said rotating member.

3. In a power operated press having a rotating member for actuating a main tool, in combination, an auxiliary crank shaft for operating an auxiliary tool, gearing between said rotating member and said auxiliary crank shaft adapted to turn said auxiliary crank shaft faster than said rotating member, a clutch for connecting and disconnecting said rotating member and said auxiliary crank shaft through said gearing, and means operable by the rotation of said rotating member for actuating said clutch to connect said rotating member and said auxiliary crank shaft during a portion only of the rotation of said rotating member.

4. In a power operated press having a main rotating member for actuating a main tool, in combination, an auxiliary rotatable member for actuating an auxiliary tool, gearing between said main rotating member and said auxiliary rotatable member adapted to turn said auxiliary rotatable member faster than said main rotating member,

a clutch for connecting and disconnecting said main rotating member and said auxiliary rotatable member through said gearing, and means operable by the rotation of said main rotating member for actuating said clutch to connect said main rotating member and said auxiliary rotatable member during a portion only of the rotation of said main rotating member.

References Cited in the file of this patent UNITED STATES PATENTS 1,898,279 West Feb. 21, 1933 1,972,329 Byerlein Sept. 4, 1934 2,032,836 Criley Mar. 3, 1936 2,106,830 Criley Feb. 1, 1938 

